WARNING: You are using pip version 19.3.1; however, version 20.0.2 is available.

執行下面兩個命令都不行。 python -m pip install --upgrade pip python3 -m pip install pip==20.0.2 使用國內下載源（成功）： C:\WINDOWS\system32>pip --version pip 19.3.1 from c:\users\yanghang\appdata\local\programs\python\pytho

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